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Last updated: 20 April 2021
Status:Schlussbericht
Datum:Montag 4 Dezember 1978
Zeit:19:45 MST
Flugzeugtyp:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Fluggesellschaft:Rocky Mountain Airways
Kennzeichen: N25RM
Werknummer: 387
Baujahr: 1973
Betriebsstunden:15145
Triebwerk: 2 Pratt & Whitney Canada PT6A-27
Besatzung:Todesopfer: 1 / Insassen: 2
Fluggäste:Todesopfer: 1 / Insassen: 20
Gesamt:Todesopfer: 2 / Insassen: 22
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:15 km (9.4 Meilen) ENE of Steamboat Springs, CO (   USA)
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Steamboat Springs Airport, CO (SBS/KSBS), USA
Flug nach:Denver-Stapleton International Airport, CO (DEN/KDEN), USA
Flugnummer: 217
Unfallbericht:
The aircraft took off from Steamboat Springs at 18:55 but was forced to return after encountering severe icing conditions. The Twin Otter struck a mountain at 10530 feet.

Probable Cause:

PROBABLE CAUSE: "Severe icing and strong downdrafts associated with a mountain wave which combined to exceed the aircraft's capability to maintain flight. Contributing to the accident was the captain's decision to fly into probable icing conditions that exceeded the conditions authorised by company directive." 

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 150 days (5 months)
Accident number: NTSB/AAR-79-06
Download report: Final report

Informationsquelle:
» NTSB Safety Recommendations A-79-70
» NTSB-AAR-79-6


Sicherheitsempfehlungen

NTSB issued 4 Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Steamboat Springs Airport, CO to Denver-Stapleton International Airport, CO as the crow flies is 186 km (116 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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